PORT ST. LUCIE, Fla. -- Mets first baseman Daniel Murphy has a sprained right knee and will be examined by team doctors Wednesday. Murphy, who injured the knee during Tuesday’s game against the Cardinals, was limping as he walked through the clubhouse Wednesday morning.

For now, the team is describing his status as “day-to-day.” But if Murphy’s injury turns out to be more serious than initially thought, it could open the door for prospect Ike Davis to make the Opening Day roster. The injury could also help Mike Jacobs’ chances of making the team.

“It all depends on what the doctors tell us today and in the next couple days,” general manager Omar Minaya said.

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Jose Reyes will play in another minor-league game Wednesday. The Mets still haven’t given any indication of whether Reyes will be ready for Opening Day, but it should become clearer within the next 24 hours. The Mets leave for St. Petersburg after Thursday’s game here and will need to decide whether to take Reyes with them or leave him in Port St. Lucie to continue playing in minor-league games.

“Let’s get through today,” Minaya said. “Let’s find out how he bounces back from running the bases yesterday. Then of course we’ll have to evaluate other things. He has been getting some at-bats but it’s a whole bunch of things and of course what the medical people tell us.”

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As expected, the Mets optioned outfield prospect Fernando Martinez to Triple-A Buffalo. Martinez, 21, had an impressive spring. He hit .383 with three home runs in 21 games. But the Mets want him to get a full, healthy year in Buffalo before bringing him back to the majors.

Minaya said Martinez will play some center field but will primarily be used as a corner outfielder.

“I think he’s one of those guys who it hasn’t been determined what role he’s going to play in the major leagues,” Minaya said.

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The Mets host the Marlins Wednesday at 1:10 p.m. Here's the starting lineup: